add dotnet agent version (#361)

Author: chaudharysaket

dotnet/publish-layers.sh

@@ -79,6 +79,7 @@ function get_agent {
     elif [[ "${GITHUB_REF_NAME}" =~ ${VERSION_REGEX} ]]; then
         # Extract the version number from the GITHUB_REF_NAME using regex
         NEWRELIC_AGENT_VERSION="${BASH_REMATCH[1]}"
+        echo "$NEWRELIC_AGENT_VERSION" > version.txt
         echo "Detected NEWRELIC_DOTNET_AGENT_VERSION: ${NEWRELIC_AGENT_VERSION}"
     else
         echo "Unable to determine Dotnet agent version, GITHUB_REF_NAME environment variable did not match regex. GITHUB_REF_NAME: ${GITHUB_REF_NAME}" >&2
@@ -90,6 +91,7 @@ function get_agent {
     curl -L $url -o $AGENT_DIST_ZIP
     mkdir -p $BUILD_DIR
     tar -xvf $AGENT_DIST_ZIP -C ./$BUILD_DIR # under $BUILD_DIR/newrelic-dotnet-agent
+    cp version.txt $BUILD_DIR/newrelic-dotnet-agent/version.txt
     rm -f $AGENT_DIST_ZIP
 }